Information about the 28BYJ-48 stepper motor and ULN2003 driver board. The 28BYJ-48 is one of the cheapest stepper motors you can find.Although it is not super accurate or powerful, it is a great motor to use for smaller projects or if you just want to learn about stepper motors.
Stepper Speed Control
Wiring NEMA 17 Stepper Motor with L298N & Arduino Arduino Code – Controlling NEMA 17 Stepper Motor. The following sketch will give you complete understanding on how to control a bipolar stepper motor like NEMA 17 with L298N motor driver and can serve. For the next demonstration we will add a second 28BYJ-48 stepper and ULN2003 driver set to the picture to drive two motors simultaneously. We will also make use of an advanced stepper motor library that you will need to install in your Arduino IDE. Before we get to the code let’s hook up an additional motor and driver to our Arduino. Stepper Motor Control - speed control This program drives a unipolar or bipolar stepper motor. The motor is attached to digital pins 8 - 11 of the Arduino. A potentiometer is connected to analog input 0. The motor will rotate in a clockwise direction. The higher the potentiometer value, the faster the motor speed. Mar 09, 2019 The main part – to simply call it, the rotating base – is the plastic cup holder that is driven by a NEMA 17 and controlled by the A4988 driver. Arduino UNO is the brain of the whole system. The whole assembly of the stepper motor is a bit more complex than a plastic cup holder. This library allows you to control unipolar or bipolar stepper motors. To use it you will need a stepper motor, and the appropriate hardware to control it. For more on that, see Tom Igoe's notes on steppers. The text of the Arduino reference is licensed under a Creative Commons Attribution.
Stepper motors, due to their unique design, can be controlled to a high degree of accuracy without any feedback mechanisms. The shaft of a stepper, mounted with a series of magnets, is controlled by a series of electromagnetic coils that are charged positively and negatively in a specific sequence, precisely moving it forward or backward in small 'steps'.
There are two types of steppers, Unipolars and Bipolars, and it is very important to know which type you are working with. For each of the motors, there is a different circuit. The example code will control both kinds of motors. See the unipolar and bipolar motor schematics for information on how to wire up your motor.
In this example, a potentiometer (or other sensor) on analog input 0 is used to control the rotational speed of a stepper motor using the Arduino Stepper Library. The stepper is controlled by with digital pins 8, 9, 10, and 11 for either unipolar or bipolar motors.
The Arduino or Genuino board will connect to a U2004 Darlington Array if you're using a unipolar stepper or a SN754410NE H-Bridge if you have a bipolar motor.
For more information about the differences of the two types, please take a look at Tom Igoe's page on stepper motors.
Hardware Required
- Arduino or Genuino Board
- 10k ohm potentiometer
- stepper motor
- U2004 Darlington Array (if using a unipolar stepper)
- SN754410ne H-Bridge (if using a bipolar stepper)
- power supply appropriate for your particular stepper
- hook-up wires
- breadboard
Circuits
Below you'll find circuits for both unipolar and bipolar steppers. In either case, it is best to power your stepper motors from an external supply, as they draw too much to be powered directly from your Arduino board.
In both circuits, connect a 10k pot to power and ground, with it's wiper outputting to analog pin 0.
Note: Both circuits below are four wire configurations. Two wire configurations will not work with the code provided.
Unipolar Stepper Circuit and schematic
Unipolar Motor Knob Circuit
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Stepper Motor Driver Arduino Uno
Unipolar Motor Knob Schematic
Bipolar Stepper Circuit and schematic
Bipolar Motor Knob Circuit
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Bipolar Motor Knob Schematic
Code
For both unipolar and bipolar steppers
Stepper Motor Control - speed control
This program drives a unipolar or bipolar stepper motor.
The motor is attached to digital pins 8 - 11 of the Arduino.
A potentiometer is connected to analog input 0.
The motor will rotate in a clockwise direction. The higher the potentiometer value,
the faster the motor speed. Because setSpeed() sets the delay between steps,
you may notice the motor is less responsive to changes in the sensor value at
low speeds.
Created 30 Nov. 2009
Modified 28 Oct 2010
by Tom Igoe
*/
#include <Stepper.h>
const int stepsPerRevolution =200;// change this to fit the number of steps per revolution
// for your motor
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution,8,9,10,11);
int stepCount =0;// number of steps the motor has taken
voidsetup(){
// nothing to do inside the setup
}
voidloop(){
// read the sensor value:
int sensorReading =analogRead(A0);
// map it to a range from 0 to 100:
int motorSpeed =map(sensorReading,0,1023,0,100);
// set the motor speed:
if(motorSpeed >0){
myStepper.setSpeed(motorSpeed);
// step 1/100 of a revolution:
myStepper.step(stepsPerRevolution /100);
}
}
See also
Stepper Motor Driver Arduino 8825
- Stepper myStepper = Stepper(steps, pin1, pin2, pin3, pin4)
- stepper.setSpeed()
- stepper.step()
- MotorKnob - Moves the shaft according to the position of the knob of a potentiometer.
- StepperOneRevolution - Turn the shaft one revolution clockwise and one counterclockwise.
- StepperOneStepAtATime - Single stepping to check the proper wiring of the motor.
Last revision 2018/08/23 by SM